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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c6142b11af7895dc20320101cefb7fbae1144cd475ba7e429c8bcf9098284711' 
  AND token = 'b3emkUYL8gq4JnaDc2pEvXdYQQleUj2Jsmn663Vt0OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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