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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '01ed0bdf36301670293fbd3e60a03949db88db00a2804995a0cf9fdc0d0e70a1' 
  AND token = 'lMKEWQdgeb6Xn+cPaNYAlH0nQf6Y8wmEzmHfn0Smxoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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