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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a3527bb52dc21a20f7e2a1b6f049815af23d52a33f6a0c3c2a70afad1084457b' 
  AND token = 'O+I1/Ddl53vq1qtHdkT/v4CeF/0mqtBO1s8hEn4PvDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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