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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ad030eebad40e47ce90b310b9ce44ee07458e4eefdc6d41ca8fdb0f4f13b3893' 
  AND token = '+AV3m2U2xrsFGToXIm5TxMSTNufeYoXBPAYMWunc1II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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