SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '79a9295ec5b1c17f92df1ac0e7f22bfb5b0630acba519f6580628712db11939c' 
  AND token = 'dzGToUgwOjmQtuqPwGqiTEkVWVbqBFRl8vwQG59P7jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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