Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473a9a416ecd42a2fded02044eac6ac5f374d36c51abac62b762aef264a92f94' 
  AND token = 'Yzctu/+wL9ucItuY5nPekbNts2jJYBSUYCCaxa9yfIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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