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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fe4d3b9dc1e6f16c48e23eb875ee8bcced2160704079da453d7d716574e73d7f' 
  AND token = 'E3MeoEy9sVPOR6ztFG1xi7+zoHZVCmePZKF5GFgkWgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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