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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '08f1f5849814577cfd0810f9c9de1ff1de1d5b03caa7846ef26d5ec42068be42' 
  AND token = '0wUmcfEpXXby83JK/VThbDpHp88KDETxVCGya12EWrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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