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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee69b1c0386eea32e324b718c760d880315aa8b40f189b3de13fcae3fb275236' 
  AND token = 'imM5cPBNMsGtKky07pcIEghZ1QvnoUMxt6tGxqhlMcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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