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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '755dca07e4378f4467f1d45302ce467f99338aecc21f336e2a9e646c6e4941f2' 
  AND token = 'XLO8N8Tb5hYG805J3v7W6RlfBxhkXHcw1W46F7oTTG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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