SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a9d1360bc72274c6c8997a21c21f89b3b5b18b983f510e3ccdf1fd1093a36e54' 
  AND token = '1M5eivLbMWlTUeNrjZ1UH+O19+PTF3vFYjXTeheZifo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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