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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e37893d22a905b7f1f05418668a2fa45059aeee289a80e94803e7d76f5dca931' 
  AND token = '5/KdznAsRp6E8L3GfKtMk7wlw5GJpj66ZEswk7EiUM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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