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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c1dc97aade1577141cbc3300f7a2940e4c21a2eb1b10dcd37dabe713a42db305' 
  AND token = 'e2yV3FAAYW8gl00KSHW1Kn1TFyffvIw8Pps/SFpWi/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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