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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f3d00e145843d435ac3ac48cd13e9109b0d4d62d4fc4d3bf35d5f14f68ab1db' 
  AND token = 'Ftd3U6jxUFU3WtzpSyeUMC9m67ZiFa92IJkKK8Eh1rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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