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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'de3de3c30c54249cefe4baa774564978c64e72e2bad48f2870ac0365e42fb02a' 
  AND token = 'os81CcXCvOGQxySn0FdV8x69W6KKb7Z+1N1ejPRy0GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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