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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '105be4894fcb4ec7b4b5fa725b5e8c542dcfe3b8f0f30f7beda0562f5cd1c957' 
  AND token = '4HqaBOWTv6YdAxHzCOSuh+Xpo9O0BH1rQn++skQZGc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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