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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3120e4df9e4eaa1349dbb5b85f3b0859b0e616c4b5d6b160d11d157ca2a05266' 
  AND token = 'v+7IUepi9xTS1JyOPuAmoWqBOY0XoScqCXp9bdGQvlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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