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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd63c132bf65d6c1c42af39a83ffc0b4644620750b7082dc118185dc7005eaf0d' 
  AND token = 'My+8bjN5NTo01zeXQ8f92XK/Ux7SqRJEh/mbXfB5YZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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