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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e3aea93fcf68d71b71490f1fd6d230a00f1f74140a080f272ce61dbf76412218' 
  AND token = 'n90wobvMIRICdJwXo5wrfnbLutkxloxC+1gOsGsXwsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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