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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '406a34c715d1114da00d48bbf4cd7a76ae882d6f89f89ef94ac753c1e7871189' 
  AND token = 'LBeEqKf99aGTR8J2m3ipnnKqx5KOHCz4mSZrGpfOxW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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