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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'af95ddd786173752d6e3fc895cf287b2a4d6bc58f8686e8f897c4d5eebec7fb9' 
  AND token = 'ND5iPPVaI04xxr2JRvqUhksBmcR+ST2rvubaY1TXdOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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