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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '47e0fcb210937527a8013b63189e02217635f2b90e080b35406af01ea2cb7867' 
  AND token = 'jtsVYc0Kfllp6/6IaMIYCW2gf6mkPbYC756CDii1S6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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