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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4d87455415b8ca8c8d39be1029b786f859f0c85a983934e7e84b0080414aab36' 
  AND token = '3SLnMBADXIrW4STAuFUScNOUn88WeXi8P/CJcNWRW9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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