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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c7ccef2bd827b3f0cd8056db0c6d065d9a18d9833ad175b4cc3f1a201b055631' 
  AND token = 'eMZp58RLGw71UYjhyoQTL6cNh7bpGr9yBCrOtthbcZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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