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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '259b7dddf381316f7426bed602433801cf3685fc7c38a5e563a1e5867daafaf2' 
  AND token = '3fARG42yB2sAPNV1DWfmRi6ZbFaED++N+u4nmBGvLYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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