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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '25ceecc95b465b44488164238be953d7c05ecbbb6a6d49f5ac5010c5639d7a9f' 
  AND token = 'xN6TNCZDz43yj+Q1vsGp7hgiW5bxOFZydQ42lgoGoYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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