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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '68e00995e9cd4535efc59ca7073fffef509f6cb5aaf5a9b36d8627acd559f457' 
  AND token = 'QFICkyrHjeeYp3FmejJXl7e0ZRPdmePZ1WP2yUzz8U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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