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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bb4396c98496c2255fcaefa60ba1afa55bc55c80a964ad49ea917eb18e6e7b9e' 
  AND token = 'l0UQ4xmVU8uGcVUq6OUxFFgu7sXt/ne13MOoD4ypLdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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