Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e571fb23c0f88fd07a7d1ff6e69aae682ea4e5037aa8b533b48e4ffdaa77d86f' 
  AND token = 'FAHu1wlr+HzUgZR6iEbsvz1eboTBSmjwhKX7TRru55I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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