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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '79d500a47575f410f128d6dacf6e7031c1dc7966166f63ee9885abd455187065' 
  AND token = 'GOxIFZuAPPero7Qby26VbG50kP+ExNB/MibM0HZQ/eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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