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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '723e90801c5bc0eaedc646a2b18fb2c5984ec2d62eacc08fe8e004714585f297' 
  AND token = 'wHg1X1ruu1HEL4dB8M04t7VdgSWssPPnjzCl7jpxYrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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