SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e57e9c8fd8133a1cf9697a8b5236044775cb17f88a85f925296a01dde99f4f89' 
  AND token = 'ynjcu/CtzbfAmtGrfR4DvJZFdSKa6hmjqciPwIMWrPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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