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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '13b9d17ee070c7ad2eac4df3255064ced85fd0f5d1c76889d953001818f26be7' 
  AND token = 'j6iraW9GQNAXU/49o3OgzaAEXhumwnOsvFb8K2aGW9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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