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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '46f7aa332c68bc730043b2e9499a965103f8485f615189ef2ec0119d5d4e17ce' 
  AND token = '3db+cnjuSTAJ2aOIRU4UPWOtI/RdE86zsMPG/7o+7QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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