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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'efc61a6bd0515196e3fe4559d640bbe8435946e7fd5a27c46b3aaa1bb47aad4f' 
  AND token = 'ln8H3Yt5y8gvDWRdmbbP0YZxxSU0V+Eub+wO406Ncu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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