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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5c2b60a6e29fc0c6b69845eb958c608421cfbd2cbdc768453a1e8f2277e87da6' 
  AND token = 'xgpPyhVX1pmFDoh0nZEt65MStWcSUxY/jHD1ZO1ucT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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