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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3b8b15963243e772b3e626dfbc02c04b4992345eb246f8eac5d9803fd2c2e352' 
  AND token = 'euUD1jNZQ3a6M8j/k0e4nNhcieawl8Sun0yStLxRx3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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