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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4cc5ac31c870c7ab4e1942b1a4339a18f7ffc61ac4958a2279df327a29c9a31e' 
  AND token = 'zMdtXkcoUdjvlxmQSQbPpjYmKZHojkqhyErDHs/vUr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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