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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f25ca8249cd4f96487f692a7122a9b48ad302595771a28a76c4084e74711cf7a' 
  AND token = 'W/fzHaJLfO65HcB82nlsp4D4LWjrZShuUbgfD1T28TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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