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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '669ebd0262d5183367b7648939a951475a4fb6004a510c6c7e7f76634e430e35' 
  AND token = 'QlyKOWNg0ZikHEU72SX0jH31rzlAn5IZyN7gQvy+oYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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