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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '18880c0c799c059a0972002d8da6d30c56e12692e8572520fd09eaa887b34671' 
  AND token = '80QMp+inWUUI83zHKuSoEe8lc4alVHu4PkElaimHXaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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