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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e5eb229f39240a20b0fd2e120dd483a54afeb9a824bb442fba8d0cdaf59bc6cc' 
  AND token = 'TKJ9k0QiqJ+tTGJU6hTNJQ2+OwNHCsnt6AGYTXRvug0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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