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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '200a940c73dd5969b03c8c5b87069aa301e44abf472ebee4993974f527df0a48' 
  AND token = '0ALGZQyjgJ3r8slJe8cGxgkZi/j07JwKt/AAEWer/Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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