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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '21fc3dcff82182309d49672be44e25859681d5dc92e10a95e10c149ce681e117' 
  AND token = 'WMMAcCIOPS/C3WlvNpN+z8NY0ta0dLxF8cKc0HNzpGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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