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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1d8420e7cf924818b32c9bbf70ca29b41c002211eee8d172542a8648b9a255a9' 
  AND token = 'FiLBqIlCmjtMZyKq8reyQlzsb2Y4F7Avv76oohZyYtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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