Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61a580601fd2ce18cf8550f20f3ca2c2a54153cd47f1dfbe9a9272eb117f6ce' 
  AND token = 'RSgRzPgabOMWr45SPrkqnuPEWo18o1Ct87/NPjgTbXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}