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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '00b828267364be27ab89c795e9437abd5d45f0b9ad8bc74e6d7b9541e1acfdc3' 
  AND token = 'KJcTzrLdU9XyEfqHVWZFUrtM8SSk/juH1toATWOiWAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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