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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '589e6c926eb41dcbab76c441c461ae50142daf97b01e23912ea6ada45aa8ea97' 
  AND token = 'MWei3/GoBEV5s6G3/9i5eOTRTV4+DnpfkEUTnSAz8Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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