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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '68d21f068887c7b430dcfa8b608c3e6c4cab35769ac3c239b0529e4f17baa58c' 
  AND token = 'rNu5h2Hf8fpbJnpmeQEyTce10RV/Cuf6xIgMYJ+yNoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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