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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '5d5eb9b6b5de309ec86afdb3a1cb39569731dfc29df3386db2ca410add4ea94a' 
  AND token = '73I+umSu+qJ1/Unc/6cr4miCa4yQChcMk4XsMdnQ44I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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