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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a3827065ffa19118f20a0f535cb31606d63b544db3581e9b1b2eb83630d1b5ca' 
  AND token = 'rgoDeBXLJZWZzT4WVo/L+OdyS6lad023tRhQAVYn3JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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