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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6511469feb56975279bc7d7d338a1c3f517474020d1b58344d7c106050adcaed' 
  AND token = '1+wAUBorPVR5Hpb3nROChLh7yumQ5Qrgl8caiUIReA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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