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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '1b63baa7a9c7fcfa4d80ace2bdf9acc61b8a202e1cfaac787cf84c55d76e5605' 
  AND token = '40qD94L3mH5Rs2107SgACmzixA+0Z4oi3799yOZU4dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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