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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f61bef63f0263643000383d41c206cc4842bf1b9a4213d295fbcc389fa4bf2bf' 
  AND token = 'KNasrT1yTvDn+hi7Hr210PKyTtDzkxpBUiHFy6sFqK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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