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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'be3121086c77a519bcb95480f0e39ef68f60a8c27fc1a5b19f03a3bcf086d8f0' 
  AND token = '/8SE0nR12ODaBBLgxWwqDbkYFPVXk+rsLgswV0k3DG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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