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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b1813bb9789eefd0c319869defeb2a4e277ed3362136c217dc73388964e31d5a' 
  AND token = 'ZMVJLgKgn0UNImfO+sEV4tJS2wJez4wmigf9TrfuRUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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