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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0fe72c1e1a3ee3b749609a11efcd75f734e65d2cbf16702a0186cefe7af1c2db' 
  AND token = 'U87B66bfSgB2EMxRoJjEo2Qnn2dnfoxBkF2e4dVJZfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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