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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3e6957d1623454e49c233e307592d1f1a6e0b6e7d53cbf2654045207ef43ff72' 
  AND token = '4GR4MArh7JUiD0ZvmUJAwvbTh0jAuDhMvcs3pTCGGQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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