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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '914e55aa1ccd08f937d16879f9b5c7168981f5b2a50dffd3f9009f9a7a560df3' 
  AND token = 'bJgFiOw1PK+Dxi2sFqah5MEXxQWNQiSpuV1bgfalZP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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