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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '42869c16b94ca4d5f462068e32d7791ded51b4c72632152b9b5a8e8b3dc18f81' 
  AND token = 'OiZGj4LbLTMtVdgrvNyx9LlsjLI5oi/mh1yVOs6NuV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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