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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bc1c2457495eeef300e0f4821530efd4b9dd638422e7e22dac0850d8eddede58' 
  AND token = 'H4Vk9llk+wnfvwKjIE1bn2Q0tJGpcTptgIUr52GQWE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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