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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2c39b951e921c037d37eb055e9004c93c8949373f75a8e5bd30e52d824ca600c' 
  AND token = 'o8igFdFosfiozA/14XGinMSJD0qLcD/eIgkn1G+EzJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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