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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a9dba31334a16b1a46858d99703be7f5b09215ece0341e4d2c6362821ba0ef10' 
  AND token = 'R3hmREB0MJz0pGAQYtQ+QCtp1jzjVpW36bscnSZQm8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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