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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '28b34e67694387699631458fe1ed89c6ccaba3683ef107847de43dbea0c042d8' 
  AND token = 'zwTa0Vsd5nbIjOSkoRG6hR8sLPVKFxmpADg9aD6J1B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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